US9363583B2 - System and method for reducing the stimulated Raman scattering crosstalk in channel monitoring - Google Patents

System and method for reducing the stimulated Raman scattering crosstalk in channel monitoring Download PDF

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US9363583B2
US9363583B2 US14/142,392 US201314142392A US9363583B2 US 9363583 B2 US9363583 B2 US 9363583B2 US 201314142392 A US201314142392 A US 201314142392A US 9363583 B2 US9363583 B2 US 9363583B2
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channels
wavelength
wavelength channels
channel
srs
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US20150189407A1 (en
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Zhiping Jiang
Jian Zhong
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Huawei Technologies Co Ltd
FutureWei Technologies Inc
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FutureWei Technologies Inc
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Priority to PCT/US2013/078219 priority patent/WO2015099812A1/fr
Priority to CN201380081906.4A priority patent/CN105900362B/zh
Priority to EP13900259.6A priority patent/EP3078140B1/fr
Priority to ES13900259T priority patent/ES2725354T3/es
Assigned to FUTUREWEI TECHNOLOGIES, INC. reassignment FUTUREWEI TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JIANG, ZHIPING, ZHONG, JIAN
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0224—Irregular wavelength spacing, e.g. to accommodate interference to all wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0272—Transmission of OAMP information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0066—Provisions for optical burst or packet networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0049—Crosstalk reduction; Noise; Power budget
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring

Definitions

  • the present invention relates to the field of optical communications, and, in particular embodiments, to a system and method for reducing the stimulated Raman scattering crosstalk in channel monitoring.
  • low frequency modulations can be applied to wavelength channels to carry channel wavelength information and other identification information, which improves fiber link management and enables power monitoring.
  • Low frequency modulation based channel monitoring e.g., tone based channel monitoring
  • SRS stimulated Raman scattering
  • a method by an optical receiver for suppressing stimulated Raman scattering (SRS) crosstalk between wavelength channels in a received optical signal includes receiving an optical signal comprising a plurality of wavelength channels.
  • the wavelength channels are split, at the optical receiver, into a first set and a second set of wavelength channels.
  • the first set and the second set comprise about a same number of non-overlapping wavelength channels.
  • the method further includes subtracting from each first wavelength channel in the first set a corresponding second wavelength channel in the second set.
  • an apparatus for suppressing crosstalk between wavelength channels in a received optical signal comprises an optical splitter configured to split an incoming optical signal comprising a plurality of wavelength channels into a first set and a second set of wavelength channels.
  • the first set and second set comprise about a same number of non-overlapping wavelength channels.
  • the apparatus further comprises a first photo-detector coupled to a first port of the optical splitter and configured to convert the wavelength channels in the first set into a first set of electrical signals proportional to the wavelength channels in the first set.
  • a second photo-detector is also coupled to a second port of the optical splitter and configured to convert the wavelength channels in the second set into a second set of electrical signals proportional to the wavelength channels in the second set.
  • a circuit is coupled to the first photo-detector and the second photo-detector and configured to subtract signal amplitudes between each corresponding pair of electrical signals in the first set of electrical signals and the second set of electrical signals.
  • a method by an optical network component for suppressing crosstalk between wavelength channels in received optical signals includes receiving a plurality of wavelength channels corresponding to low frequency modulation signals, and splitting the wavelength channels into a first set and a second set of wavelength channels.
  • the first set and the second set comprise non-overlapping sets of wavelength channels.
  • the wavelength channels are then converted in the first set and the second set into electrical signals.
  • the method further includes subtracting signal amplitudes between each corresponding pair of electrical signals in the first set and the second set, which reduces SRS crosstalk in the signal amplitudes corresponding to the wavelength channels.
  • FIG. 1 illustrates an example of a wavelength division multiplexing (WDM) optical communications system
  • FIG. 2 illustrates a stimulated Raman scattering (SRS) effect in multiple wavelength optical signals
  • FIG. 3 illustrates an embodiment of a system/apparatus for SRS crosstalk suppression
  • FIG. 4 a illustrates total optical power of multiple optical channels including channel ⁇ m modulated by frequency f m ;
  • FIG. 4 b illustrates power redistribution of channel ⁇ m modulated by f m to other channels due to SRS effect
  • FIG. 5 illustrates an embodiment of a method for SRS crosstalk suppression
  • FIG. 6 is a diagram of a processing system that can be used to implement various embodiments.
  • SRS stimulated Raman scattering
  • the schemes herein suppress or reduce the SRS crosstalk in the signals, which reduces signal distortions or errors, e.g., at a receiver.
  • the SRS is reduced or suppressed by separating the channels into even and odd channels, and then performing subtraction (of wavelength channel powers) between the two sets of channels.
  • the channels can be separated by a relatively low cost interleaver (ITL) into even and odd channels.
  • ITL relatively low cost interleaver
  • the SRS crosstalk is then reduced by subtracting powers or amplitudes of the even channel signals from the odd channel signals (or vice versa).
  • a wavelength selective switch can be used to separate the channels into two sets on which the subtraction is then performed.
  • the signals can be low frequency modulation signals used for channel monitoring, e.g., tone based channel monitoring in coherent or 10 Gigabit (10 G) systems.
  • FIG. 1 shows an example of a WDM, or dense WDM (DWDM), optical communications system 100 .
  • the system 100 includes reconfigurable optical add-drop multiplexers (ROADMs) 110 connected to each other via optical fiber links 101 .
  • ROADMs reconfigurable optical add-drop multiplexers
  • FIG. 1 shows two ROADMs 110 connected to each other via optical fiber links 101 .
  • the ROADM 110 switches WDM traffic at the wavelength layer.
  • the ROADM 110 comprises an optical add-drop multiplexer that performs wavelength selective switching. This allows individual or multiple wavelengths carrying data channels to be added and/or dropped from a transport fiber without the need to convert the signals on all of the WDM channels to electronic signals and back again to optical signals.
  • a ROADM 110 can transmit on a fiber link 101 (or links) and receive on another fiber link 101 (or links). Additionally, a channel tracking (CT) detector/module 120 is coupled at ingress and egress of fiber links 101 of the ROADMs 110 . The CT detector/module 120 performs channel monitoring based on the low frequency modulation in the received signals. The channel monitoring may include power measurement and wavelength identification of optical signals passing through the fiber links 101 .
  • CT channel tracking
  • the signals received on a fiber link 101 may include multiple wavelength channels.
  • the multiple wavelength channels propagating in a fiber link 101 may suffer from the SRS effect, where energy in lower wavelength channels tend to transfer to higher wavelength channels, thus changing the original powers/amplitudes of the wavelength channels (which is referred to as crosstalk) and causing signal distortion in the channels, as seen by on the receiver side.
  • Channel monitoring at a CT detector/module 120 e.g., at an output of an optical amplifier on the fiber, is affected by the distortions in low frequency modulated signals due to the SRS crosstalk. This results in lower communications efficiency and performance.
  • FIG. 2 illustrates a SRS effect in multiple wavelength channel signals.
  • SRS Signal Power
  • the number of spans the number of channels
  • channel distribution the fiber type.
  • the SRS crosstalk is approximately proportional to the frequency difference between two channels. Low frequency modulation on one channel is also transferred to other channels.
  • the detected tone power also includes contributions from other channels.
  • the channel ⁇ 1 has low frequency modulation f1. Due to SRS, f1 appears on channel ⁇ 2 and ⁇ 3.
  • the SRS crosstalk caused error can be more than 5 dB in multi-span systems, making power monitoring useless. The error can be so large that even the channel detection is in error.
  • the CT detector/module 120 is configured to suppress the SRS in the received signals. This is achieved by splitting the received multiple channel signals into two non-overlapping sets of equal number of channels, and then subtracting channel pairs in the two sets from one another.
  • FIG. 3 illustrates an embodiment of a system/apparatus 300 for SRS crosstalk suppression, which can be used when detecting low frequency modulation signals for channel monitoring.
  • the apparatus 300 includes an optical interleaver 310 , two photo-detectors 320 (e. g., two photodiodes), two amplifier 330 (e.g., amp circuits), and a subtraction circuit 340 (e.g., an op-amp circuit).
  • the interleaver 310 is an optical device made using any suitable optical components/designs and configured to separate multiple wavelength channels into two interleaving (non-overlapping) sets of even and odd channels.
  • the interleaver 310 comprises a simple one stage Mach-Zehnder (MZ) interferometer.
  • the two sets have the same channel separation, which is equal to twice the channel separation in the original incoming combined signal at the input of the interleaver 310 .
  • the remaining components are electrical/electronic components made using any suitable electronic components/designs, including analog components, digital components, or both.
  • Each of the photo-detectors 320 converts a corresponding set of even or odd channels from optical to electrical signals.
  • the amplifiers 330 amplify the corresponding electrical signals.
  • the subtraction circuit 340 subtracts the corresponding electric signal strengths, which are proportional to the wavelength channel powers, between corresponding pairs of even and odd channels.
  • any of the electric signal domain steps can be implemented using digital signal processing (DSP) instead of using circuit components.
  • DSP digital signal processing
  • the signal subtraction in frequency domain can be implemented using DSP, e.g., via software instead of circuit design.
  • DSP digital signal processing
  • ADCs analog-to-digital converters
  • FIG. 4 a illustrates power at a plurality of channels.
  • the channels include a wavelength channel ⁇ m modulated by low frequency tone f m , channel monitoring purpose.
  • FIG. 4 b shows power redistribution in the fiber from channel ⁇ m to other adjacent channels due to SRS.
  • the channel tone may be partially transferred to all other channels through SRS effect. Due to this SRS effect, the channel's power modulated by f m is no longer strictly proportional to the original optical power for ⁇ m , but also contains contributions from other channels.
  • the channels are separated using the interleaver 310 into two paths, even channels path and odd channels path.
  • One of the two paths contains the channel ⁇ m to be measured with added SRS crosstalk from the even channels.
  • the other path contains the SRS crosstalk from the odd channels only.
  • the SRS for ⁇ m is suppressed when the SRS crosstalk of the odd channels is subtracted from that of the even channels.
  • channel ⁇ m is modulated by frequency f m .
  • some of the power of the ⁇ m channel is transferred to the adjacent channels, which is manifested as undesirable crosstalk (power redistribution) between the channels.
  • Modulation f m appears in channel ⁇ m , as well as in other channels due to SRS effect.
  • the SRS is, to some extent, proportional to the wavelength difference. Thus, the further away an adjacent channel is from channel ⁇ m , the stronger the SRS crosstalk.
  • FIGS. 4 a and 4 b show SRS crosstalk suppression for a single channel at the detector.
  • the same scheme is also capable to suppress in parallel (at the same time) the SRS crosstalk in multiple received and detected channels. In other words, subtracting the even and odd channels' powers from each other can also result in improving the signal to crosstalk ratio for multiple channels received in a combined signal.
  • the apparatus 300 may not suppress the SRS crosstalk.
  • the suppression is the largest when the channels are split evenly between even and odd channels. Usually the larger the number of channels, the higher the SRS suppression. Better suppression can be achieved by arranging the channels so that they are more evenly split between even and odd channels or any two non-overlapping sets of channels.
  • a wavelength selective switch is used in the apparatus 300 instead of the interleaver 310 .
  • the remaining components of the apparatus 300 may not be changed.
  • the WSS is based on multiple optical filters that allow splitting any group of incoming channels into a first set and a second satisfying two criteria, an equal number of channels in each set; and evenly distributed SRS crosstalk for all channels. However, the spacing between the channels in either set does not need to be fixed.
  • the WSS allows selecting any arbitrary channels from the group of incoming channels into the two sets to meet these two criteria. The two criteria are needed to efficiently suppress the SRS crosstalk by subtracting the detected channel powers between the two sets.
  • FIG. 5 illustrates an embodiment of a method 500 for SRS crosstalk suppression.
  • the method 500 is implemented at a receiver, for example, a ROADM 110 or CT detector/module 120 , which comprises the apparatus 300 or a comparable apparatus/system as described above.
  • the method 500 suppresses the SRS crosstalk by subtracting detected signals between two sets of even and add channels (e.g., using the apparatus 300 ) or between any two groups of channels that satisfy the two criteria above (e.g., using a WSS and subtraction).
  • multiple wavelength channels are received in a combined optical signal.
  • the wavelength channels are interleaved or split into two sets of equal number of channels, e.g., a set of even channels and a second set of odd channels.
  • This step is implemented in the optical signal domain, e.g., using an interleaver, a WSS, or any other suitable device.
  • each pair of corresponding channels in the two sets is subtracted from one another, resulting in suppression of SRS crosstalk for each received wavelength channel.
  • This step is implemented in the electrical signal domain, using detectors and amplifiers that convert and amplify the channel signals from optical to electric domain, and using an electric circuit for subtracting the signals.
  • FIG. 6 is a block diagram of an exemplary processing system 600 that can be used to implement various embodiments.
  • the processing system 600 can be used to implement some steps of the methods above using DSP and software.
  • Specific devices may utilize all of the components shown, or only a subset of the components and levels of integration may vary from device to device.
  • a device may contain multiple instances of a component, such as multiple processing units, processors, memories, transmitters, receivers, etc.
  • the processing system 600 may comprise a processing unit 601 equipped with one or more input/output devices, such as a network interfaces, storage interfaces, and the like.
  • the processing unit 601 may include a central processing unit (CPU) 610 , a memory 620 , a mass storage device 630 , and an I/O interface 660 connected to a bus.
  • the bus may be one or more of any type of several bus architectures including a memory bus or memory controller, a peripheral bus or the like.
  • the CPU 610 may comprise any type of electronic data processor.
  • the memory 620 may comprise any type of system memory such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), read-only memory (ROM), a combination thereof, or the like.
  • the memory 620 may include ROM for use at boot-up, and DRAM for program and data storage for use while executing programs.
  • the memory 620 is non-transitory.
  • the mass storage device 630 may comprise any type of storage device configured to store data, programs, and other information and to make the data, programs, and other information accessible via the bus.
  • the mass storage device 630 may comprise, for example, one or more of a solid state drive, hard disk drive, a magnetic disk drive, an optical disk drive, or the like.
  • the processing unit 601 also includes one or more network interfaces 650 , which may comprise wired links, such as an Ethernet cable or the like, and/or wireless links to access nodes or one or more networks 680 .
  • the network interface 650 allows the processing unit 601 to communicate with remote units via the networks 680 .
  • the network interface 650 may provide wireless communication via one or more transmitters/transmit antennas and one or more receivers/receive antennas.
  • the processing unit 601 is coupled to a local-area network or a wide-area network for data processing and communications with remote devices, such as other processing units, the Internet, remote storage facilities, or the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)
US14/142,392 2013-12-27 2013-12-27 System and method for reducing the stimulated Raman scattering crosstalk in channel monitoring Active 2034-06-11 US9363583B2 (en)

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Application Number Priority Date Filing Date Title
US14/142,392 US9363583B2 (en) 2013-12-27 2013-12-27 System and method for reducing the stimulated Raman scattering crosstalk in channel monitoring
CN201380081906.4A CN105900362B (zh) 2013-12-27 2013-12-30 一种降低信道监测中受激拉曼散射串扰的系统和方法
EP13900259.6A EP3078140B1 (fr) 2013-12-27 2013-12-30 Système et procédé de réduction de la diaphonie de diffusion raman stimulée, dans des opérations de surveillance de canal
ES13900259T ES2725354T3 (es) 2013-12-27 2013-12-30 Sistema y método para reducir la diafonía por dispersión estimulada de Raman en la monitorización de un canal
PCT/US2013/078219 WO2015099812A1 (fr) 2013-12-27 2013-12-30 Système et procédé de réduction de la diaphonie de diffusion raman stimulée, dans des opérations de surveillance de canal

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10523315B2 (en) 2017-04-05 2019-12-31 Huawei Technologies Co., Ltd. Systems and method of multi-band pilot tone based optical performance monitoring

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170255078A1 (en) * 2016-03-03 2017-09-07 Huawei Technologies Co., Ltd. Wavelength selective switch with monitoring ports
CN110198498B (zh) * 2018-02-24 2021-11-30 中兴通讯股份有限公司 一种开关控制方法、装置、设备及存储介质
US11057142B1 (en) * 2020-07-06 2021-07-06 Huawei Technologies Co., Ltd. Method and system to estimate SRS induced gain change in optical communication networks
US12015448B1 (en) * 2021-01-13 2024-06-18 Veex Inc. Fast frequency multiplexed optical network channel identification

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425115A (en) * 1994-07-18 1995-06-13 Martin Marietta Corporation Polarization insensitive optical switch
US20050094928A1 (en) * 2003-11-03 2005-05-05 Willie Ng Bipolar RF-photonic transversal filter with dynamically reconfigurable passbands
US20090285581A1 (en) * 2008-05-19 2009-11-19 The Board Of Trustees Of The Leland Stanford Junior University Passive Optical Network Comprising an Optical Burst Mode Receiver
US20100188496A1 (en) 2009-01-26 2010-07-29 Xiaoliang Sunney Xie Systems and methods for selective detection and imaging in coherent raman microscopy by spectral-temporal excitation shaping
US20110080580A1 (en) 2006-03-10 2011-04-07 Imra America, Inc. Optical signal processing with modelocked lasers
US8078054B2 (en) 2008-06-30 2011-12-13 Alcatel Lucent Apparatus and method for improving the tolerance of tone-based optical channel monitoring to stimulated Raman scattering
US20130188565A1 (en) 2010-07-13 2013-07-25 Chao-Chun Wang System and Method for Coordinating Multiple Wireless Communications Devices in a Wireless Communications Network

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002035665A1 (fr) * 2000-10-19 2002-05-02 Fujitsu Limited Emetteur optique, repeteur optique et recepteur optique, et procede de transmission optique
US7184672B2 (en) * 2002-09-25 2007-02-27 Nortel Networks Limited Analogue maintenance detection

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5425115A (en) * 1994-07-18 1995-06-13 Martin Marietta Corporation Polarization insensitive optical switch
US20050094928A1 (en) * 2003-11-03 2005-05-05 Willie Ng Bipolar RF-photonic transversal filter with dynamically reconfigurable passbands
US20110080580A1 (en) 2006-03-10 2011-04-07 Imra America, Inc. Optical signal processing with modelocked lasers
US20090285581A1 (en) * 2008-05-19 2009-11-19 The Board Of Trustees Of The Leland Stanford Junior University Passive Optical Network Comprising an Optical Burst Mode Receiver
US8078054B2 (en) 2008-06-30 2011-12-13 Alcatel Lucent Apparatus and method for improving the tolerance of tone-based optical channel monitoring to stimulated Raman scattering
US20100188496A1 (en) 2009-01-26 2010-07-29 Xiaoliang Sunney Xie Systems and methods for selective detection and imaging in coherent raman microscopy by spectral-temporal excitation shaping
US20130188565A1 (en) 2010-07-13 2013-07-25 Chao-Chun Wang System and Method for Coordinating Multiple Wireless Communications Devices in a Wireless Communications Network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
International Search Report received in Application No. PCT/US13/78219, mailed Jun. 11, 2014, 10 pages.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10523315B2 (en) 2017-04-05 2019-12-31 Huawei Technologies Co., Ltd. Systems and method of multi-band pilot tone based optical performance monitoring

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EP3078140B1 (fr) 2019-03-13
US20150189407A1 (en) 2015-07-02
ES2725354T3 (es) 2019-09-23
EP3078140A4 (fr) 2016-12-21
WO2015099812A1 (fr) 2015-07-02
CN105900362A (zh) 2016-08-24
EP3078140A1 (fr) 2016-10-12
CN105900362B (zh) 2018-12-07

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